<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/jquery-3.3.1.js"></script>
    <script>
        $(function () {
            $("#button").click(function () {
                $("#box").css({"width":"200px","height" : "200px"})
            })
        })
    </script>
    <style>
        #box{
            width: 100px;
            height: 100px;
            background: red;
            margin-top: 10px;
        }
    </style>
</head>
<body>
<button id="button">点击改变盒子属性</button>
<div id="box">
</div>

</body>
</html>
